Function themeColorToAnsi

src/utils/theme.ts:633–646

(themeColor: string)

 * Uses chalk to generate the escape codes, with 256-color mode for Apple Terminal.
 */
export function themeColorToAnsi(themeColor: string): string {
  const rgbMatch = themeColor.match(/rgb\(\s?(\d+),\s?(\d+),\s?(\d+)\s?\)/)
  if (rgbMatch) {
    const r = parseInt(rgbMatch[1]!, 10)
    const g = parseInt(rgbMatch[2]!, 10)
    const b = parseInt(rgbMatch[3]!, 10)
    // Use chalk.rgb which auto-converts to 256 colors when level is 2
    // Extract just the opening escape sequence by using a marker
    const colored = chalkForChart.rgb(r, g, b)('X')
    return colored.slice(0, colored.indexOf('X'))
  }
  // Fallback to magenta if parsing fails
  return '\x1b[35m'
}